United States. Bureau of Economic Analysis. "Gross Domestic Product for Guam Increases in 2015 : Full Release : Tourism Spending Increases for the Second Year in a Row, BEA 16-50," Bureau of Economic Analysis (BEA) News Releases (September 21, 2016). https://fraser.stlouisfed.org/title/6148/item/602370/content/pdf/bea_newsreleases_20160921, accessed on March 21, 2025.